Highway Weather Factors

This calculator requires the use of Javascript enabled and capable browsers. These calculators are designed to present often misunderstood or misused weather factors as tools for safety. Also see our Highway Crosswind Calculator page. Use care on the highway!

Safety Calculators For
Highway Weather Factors

Fahrenheit to Celsius
This conversion of temperature is made using the formula (Fahrenheit temperature * 9/5) + 32) If you need a different scale, try this!

Enter °F

Calculated Temperature = °C

Celsius to Fahrenheit
This conversion of temperature is made using the formula (5/9 * (Celsius temperature - 32)) If you need a different scale, try this!

Enter °C

Calculated Temperature = °F

Wind Chill
Wind chill cannot be accurately calculated for outside air temperatures (OAT) greater that 50 °F (10 °C) and wind speeds less than 4 MPH (3.5 Knots).

Enter Temperature (OAT) °F °C

Enter Wind MPH Knots

Calculated Wind Chill = °F or °C

Heat Index
Determine the heat index from the outside air temperature (OAT) and Relative Humidity.

Enter Temperature (OAT) °F °C

Enter % Relative Humidity

Calculated Heat Index = °F or °C

Dewpoint
Calculate the Dewpoint from the outside air temperature (OAT) and Relative Humidity

Enter Temperature (OAT) °F °C

Enter % Relative Humidity

Calculated Dewpoint = °F °C

Relative Humidity
Calculate the Relative Humidity from the outside air temperature (OAT) and Dewpoint

Enter Temperature (OAT) °F °C

Enter Dewpoint °F °C

Calculated Relative Humidity = %

Pressure Conversion
Convert Millibars to Inches of Mercury and Inches of Mercury to Millibars

Enter Millibars Inches Mercury

Converted Barometric Pressure =

Version 3.7.8

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Highway Weather Factors

Safety Calculators For Highway Weather Factors

Safety Calculators For
Highway Weather Factors